I'm thinking about buying this book, "The Art of Software Security Assessment". It gets highly recommended and seems to be an extremely interesting read regarding a sh*tload of aspects of security. According to some, it's a 1200 page security bible

Now that all sounds very well, but it's a rather old book, from November 2006.

So I was wondering; did any of you guys read this? And do you still find it very relevant today?If not, are there other, similar, wide-coverage books out there that you would recommend instead?

Haha, yeah, guess I could have just answered your original question sorry - right over my head.

Yes, both books are still relevant. The one you're after has A LOT of code examples throughout on a variety of languages. Many, if not all, of the topics presented are definitely still useful for today.